WFP, no question for me, I'm not going to claim WFP does a better job but I will claim it does a more thorough job and of course it is easier on the body and you can work quicker thereby earning more money.
Also of course, just like any other type of house, you have all kinds of different windows in different bungalows and on leaded and georgian windows WFP is most certainly better.
There are also a great many awkward windows on bungalows, just because they are lower doesn't mean they are not difficult to get at...
Ian